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Sorry for the time you waited but I'm very very busy these times, I was having a look to your problem last week but I had no time to share the solution.

In this map example you can find my script modification to work with undefined numbers of moving objects, just make sure to rename the script trigger to "Toggle." then add a custom ID you like after the dot and assign that same id to the Elevator attachment joint you want to move.

Thank you so much, but while I was adding your script to my map, I realized that the elevator attachment joint wasn't attached to the other car and that's why it wasn't working...
But you're method is way better and sorry to waste your time.